[Objective] The morphological features of eroded gullies in rolling hill areas of black soil in Northeast China and temporal-scale variations in their morphology. were analysed in order to provide a scientific basis and empirical data to understand the development and evolution of erosional gullies in this area. [Methods] This study selected 61 typical gullies in Guofu Town, Baiquan County, China. Unmanned aerial vehicle technology was used to generate digital elevation models and manually interprets parameters such as gully length and width-to-depth ratio. Historical aerial imagery data were used to analyse the developmental changes and influencing factors of gullies. [Results] ① From 2003 to 2021, gully development in Baiquan County showed an overall intensification trend, with medium-sized gullies accounting for 60.66% of the total gullies. ② A significant variation was observed in gully morphology within the study area, with gully length, average cross-sectional area, and volume mainly distributed between 41.89—1 173 m, 11.23—440.69 m², and 895.38—107 686.57 m³, respectively. The overall shape parameter distribution was concentrated. ③ Gully length, area, and shape index exhibited a trend of increase followed by a decrease, with an average development rate of 9.64 m/a for length and 246.39 m²/a for area. The erosion gullys showed narrow and irregular shape. ④ Regression analysis revealed significant positive correlations between gully length and width, perimeter, and area (S), and significant relationships between top width and bottom width, perimeter, and S, with determination coefficients of 0.82, 0.23, and 0.58, respectively. However, gully depth showed a low correlation with erosion volume and S. [Conclusion] In typical areas of Baiquan County, the general trend in gully erosion has shown a relative slowdown compared with previous assessments, although gully erosion remains severe. Furthermore, there is an interrelationship among different morphological parameters, with gully length showing a close positive correlation with the area and perimeter of the eroded gullies.